First off there's Kamen Rider Garren from Kamen Rider Blade along with this bike, the Red Rhombus.
Next up is one of my favorite looking of all the original Showa Riders-- Kamen Rider ZX. He never did have his own televisions show, unlike all of his other Showa era compatriots. I think it would have been great if his character could have been further explored is some way.
Lastly there is a new version of Kamen Rider 2 on the horizon, and he sports his original black helmet.
Kamen Rider 2 will be available in December for Y2,940 and is a (....wait for it....) Tamashii Web Exclusive.
Expect to see official pictures and more info of all of these new figures soon.